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DERIVATIVE FINANCIAL INSTRUMENTS - Interest rate contracts designated as cash flow hedges (Details) - Cash flow hedge - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
DERIVATIVE FINANCIAL INSTRUMENTS      
Amounts of gross gain (loss) reclassified from accumulated other comprehensive income $ 87 $ 175 $ 167
Taxable loan interest income      
DERIVATIVE FINANCIAL INSTRUMENTS      
Amounts of gross gain (loss) reclassified from accumulated other comprehensive income 116 $ 175 275
Subordinated debentures interest expense      
DERIVATIVE FINANCIAL INSTRUMENTS      
Amounts of gross gain (loss) reclassified from accumulated other comprehensive income $ (29)   $ (108)